Stratus Technologies Bermuda Ltd. Patent applications |
Patent application number | Title | Published |
20090144217 | System and methods for managing rules - A method of automatically determining firing priority in a plurality of rules. The method includes the steps of determining a level of dependency of each rule; and generating a hierarchy of rules in response to the level of dependency of each rule, wherein the firing priority corresponds to the hierarchy of rules. In another embodiment, the method further includes the step of determining if the hierarchy results in an inconsistency. In another embodiment, the method further comprises the step of determining if the hierarchy results in a loop. In yet another embodiment, the step of determining a level of dependency of each rule is performed in response to an initial event. | 06-04-2009 |
20090138752 | Systems and methods of high availability cluster environment failover protection - A transparent high-availability solution utilizing virtualization technology is presented. A cluster environment and management thereof is implemented through an automated installation and setup procedure resulting in a cluster acting as a single system. The cluster is setup in an isolated virtual machine on each of a number of physical nodes of the system. Customer applications are run within separate application virtual machines on one physical node at a time and are run independently and unaware of their configuration as part of a high-availability cluster. Upon detection of a failure, traffic is rerouted through a redundant node and the application virtual machines are migrated from the failing node to another node using live migration techniques. | 05-28-2009 |
20090055676 | Apparatus and method for redundant and spread spectrum clocking - An apparatus and method for fault-tolerant and spread spectrum clocking. In one embodiment a master clock synthesizer circuit generates an output clock signal of varying frequency within a predetermined range of frequencies. A slave clock synthesizer circuit is provided to track the output clock signal generated by the master clock synthesizer circuit. If the master clock synthesizer circuit fails or generates an invalid output clock signal, the slave clock synthesizer circuit takes over and functions as the master clock synthesizer circuit. In one embodiment a method of fault-tolerant spread spectrum clocking includes generating a first digital data stream; receiving the first digital data stream, a first input reference signal and a first clock signal in a master clock synthesizer circuit; generating an first output clock signal of varying frequency by the master clock synthesizer circuit in response to the first digital data stream and the first clock signal. | 02-26-2009 |
20090037765 | SYSTEMS AND METHODS FOR MAINTAINING LOCK STEP OPERATION - A system is provided for rapidly synchronizing two or more processing elements in a fault-tolerant computing system. Embodiments of this system allow for the rapid synchronization of two processing elements through partial copies of the contents of memory associate with each processing element. | 02-05-2009 |